import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

/*
 * @author zzr
 * @date: 2025/05/11  20:20
 * @description: Callable 接口来关注线程中的返回值
 */
public class Demo16 {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        Callable<Integer> callable = new Callable<Integer>() {
            @Override
            public Integer call() throws Exception {
                int result = 0;
                for (int i = 0; i < 1000; i++) {
                    result += i;
                }
                return result;
            }
        };
//        Thread t = new Thread(callable); //err

        // 注意 FutureTask 的使用~
        FutureTask<Integer> futureTask = new FutureTask<>(callable);
        Thread t = new Thread(futureTask);
        t.start();
        System.out.println(futureTask.get());
    }
}
